Hole saw with hex sidewall holes

ABSTRACT

A hole saw including a plurality of sidewall openings is provided. The sidewall openings are shaped and grouped in patterns that improve debris ejection of the hole saw and that allow for easy access to the interior of the hole saw for manual debris removal by the user. The opening groups are space from each other by larger uninterrupted areas such that the hole saw has a high strength despite the number and size of openings provided in the saw sidewall.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

The present application is a continuation of U.S. application Ser. No.16/518,326, filed Jul. 22, 2019, which is a continuation ofInternational Application No. PCT/US2019/041175, filed Jul. 10, 2019,which claims the benefit of and priority to U.S. Provisional ApplicationNo. 62/696,141, filed Jul. 10, 2018, the content of which areincorporated herein by reference in their entireties.

BACKGROUND OF THE INVENTION

The present invention relates generally to the field of tools. Thepresent invention relates specifically to a hole saw having a pluralityof sidewall openings. In general, a hole saw includes a cylindricalstructure with cutting teeth at one end of the cylinder. In use, thehole saw spins at a high rate of speed, cutting a hole in a work piecethat has a size and shape that generally matches the size and shape ofthe cylindrical structure.

SUMMARY OF THE INVENTION

One embodiment of the disclosure relates to a hole saw including a body,such as a cylindrical saw body, and an end cap. The saw body includes acutting edge at a first end of the saw body, and a second end of the sawbody is coupled to an outer section of the end cap. The cylindrical sawbody includes an outer surface and an inner surface defining a hollowinternal area. The cylindrical saw body includes a first group ofopenings extending between the outer surface and the inner surface, asecond group of openings extending between the outer surface and theinner surface, and an uninterrupted area located between the first groupof openings and the second group of openings. In specific embodiments,the hole saw side wall openings have a non-circular shape andspecifically, all of the hole saw side wall openings have a non-circularshape.

In specific embodiments, the first group of openings includes a firstopening and a second opening, and the second group of openings includesa first opening and a second opening. In specific embodiments, the firstopening and second opening of the first group are spaced from each otherin the circumferential direction such that the first opening is notlocated above the second opening in the longitudinal direction. In aspecific embodiment, the first opening and second opening of the secondgroup are spaced from each other in the circumferential direction suchthat the first opening is not located above the second opening in thelongitudinal direction.

Additional features and advantages will be set forth in the detaileddescription which follows, and in part will be readily apparent to thoseskilled in the art from the description or recognized by practicing theembodiments as described in the written description and claims hereof,as well as the appended drawings. It is to be understood that both theforegoing general description and the following detailed description areexemplary.

The accompanying drawings are included to provide a furtherunderstanding and are incorporated in and constitute a part of thisspecification. The drawings illustrate one or more embodiments andtogether with the description serve to explain principles and operationof the various embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a hole saw and arbor, according to anexemplary embodiment.

FIG. 2 is a perspective view from below of a hole saw, according to anexemplary embodiment.

FIG. 3 is a perspective view from above of the hole saw of FIG. 2,according to an exemplary embodiment.

FIG. 4 is a side plan view of the sidewall of the hole saw of FIG. 2prior to shaping to the cylindrical structure shown in FIG. 2, accordingto an exemplary embodiment.

FIG. 5 is a perspective view from below of a hole saw, according toanother exemplary embodiment.

FIG. 6 is a perspective view from above of the hole saw of FIG. 5,according to exemplary embodiment.

FIG. 7 is a side plan view of the sidewall of the hole saw of FIG. 5prior to shaping to the cylindrical structure shown in FIG. 5, accordingto an exemplary embodiment.

FIG. 8 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 9 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 10 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 11 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 12 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 13 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 14 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 15 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 16 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 17 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 18 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 19 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 20 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 21 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 22 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 23 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 24 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 25 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

FIG. 26 is a side plan view of the sidewall of a hole saw prior toshaping to a cylindrical structure, according to an exemplaryembodiment.

DETAILED DESCRIPTION

Referring generally to the figures, various embodiments of a hole cutteror hole saw including a plurality of sidewall openings are shown. Ingeneral, a hole saw includes a cylindrical sidewall, a cutting endhaving cutting teeth at one end of the cylindrical sidewall and an endcap at the other end of the cylindrical sidewall. As will be generallyunderstood, the end cap includes a mounting structure that mounts to adriving device (e.g., a power tool) that drives the hole saw in rotationto cut a hole in a workpiece. In various embodiments, the sidewall ofthe hole saw discussed herein includes a pattern of multiple sidewallopenings strategically positioned and sized to provide improvedfunctionality while still providing sufficient strength to the hole saw.In specific embodiments, the hole saw discussed herein specificallyincludes side wall openings having non-circular shapes, and in at leastsome embodiments, Applicant believes that non-circular shaped sidewallopenings may allow for improved debris removal through the provision ofleverage points or corner.

As will generally be understood, during use of the hole saw, someportion of cut material (e.g., saw dust, chips, a plug of the materialbeing cut, etc.) material enters the central cavity of the hole saw.Some of this material eventually exits the hole saw through the sidewallholes by being ejected during spinning of the hole saw. Other materialis manually removed by pushing or prying the material out by insertionof a tool through the sidewall openings. In general and as will bediscussed in more detail below, the sidewall openings are positioned ina pattern surrounding the entire circumference of the sidewall such thatno matter what position the saw is in when it is spinning, one of theopenings is easily accessible by the user for debris removal withoutfurther rotation of the saw blade. Further, the sidewall openings arerelatively large and numerous allowing the user to conveniently accessthe interior of the hole saw blade with a tool (e.g., a screw driver) todig or pry a plug/debris out from the hole saw center. In addition,Applicant believes that because the hole patterns shown herein increaseejection of debris during cutting, the ease of plug removal is increasedbecause there is less saw dust and chips remaining in the interior ofthe hole saw blocking plug removal.

While generally increasing the size and number of the sidewall holes ofthe hole saw blade increases ease of access for debris removal, the holesaw sidewall also provides strength and rigidity to the hole saw blade.The sidewall opening designs discussed herein strike a balance betweenstrength and debris removal accessibility that Applicant believesprovide higher levels of accessibility and strength than achieved withprior designs. Further, the sidewall opening pattern is arranged suchthat there are relatively large uninterrupted portions of the sidewalllocated between hole groupings which increase strength and also providelocations for weld seam location and placement of information (e.g.,product information, logos, etc.).

Referring to FIG. 1, a hole saw, such as hole saw 10, is shown accordingto an exemplary embodiment. Hole saw 10 includes a sidewall, shown ascylindrical body 12, a cutting end 14 at a first end of body 12 and anend cap 16 coupled to the opposite, second end of body 12. In general,end cap 16 is a disc of metal material that may be coupled to body 12via a coupling structure such as a weld. In various embodiments, end cap16 includes a central mounting portion for coupling to a tool attachmentstructure, shown as arbor 18. As will be generally understood, arbor 18facilitates coupling of hole saw 10 to a driving device (e.g., an impactdriver, power drill driver, etc.) which drives hole saw 10 duringcutting.

As shown in FIG. 1, cutting end 14 includes a plurality of teeth 20 thatextend around cutting end 14. Teeth 20 may be formed in a wide varietyof designs for different cutting applications. In specific embodiments,teeth 20 and cylindrical body 12 are formed from a single, contiguous,continuous piece of metal material in which teeth 20 are formed.

Referring to FIGS. 2-4, details of cylindrical body 12 are shown anddescribed. Cylindrical body 12 is a cylindrical wall of material (e.g.,metal material) that has an exterior surface 22 and an interior surface24. Cylindrical body 12 is a substantially hollow cylinder such that ahollow internal area 26 is defined by interior surface 24 of body 12.Hole saw 10 defines a longitudinal axis 28 that extends lengthwisethrough hole saw 10, perpendicular to end cap 16 and perpendicular to aplane defined by cutting end 14. As will be explained in more detailbelow, the pattern and geometry of the openings in body 12 discussedherein provide for easy debris removal while also providing a sidewallhaving sufficiently high strength.

Referring to FIG. 4, body 12 of hole saw 10 is shown prior to shaping tothe cylindrical shape shown in FIGS. 2 and 3 to more clearly depict theopening shape and pattern. As noted above, hole saw 10 includes aplurality of openings 30 that are shaped and arranged in a patternaround hole saw 10. In the specific embodiment of FIG. 4, openings 30are arranged in a first group 32 and a second group 34 with relativelylarge areas 36 of uninterrupted portions of body 12 located betweengroups 32 and 34. To form the cylindrical shape of hole saw 10, body 12is wrapped to a cylindrical shape and free edges 38 of body 12 arewelded together to form the cylindrical body shown in FIGS. 2 and 3.

In general, large areas 36 and opening groups 32 and 34 are sized andpositioned to provide a variety of functional benefits to hole saw 10.As shown in FIG. 4, hole groups 32 and 34 are evenly spacedcircumferentially along body 12 such that when formed to a cylindricalshape, body 12 is substantially symmetrical. Similarly, the solid spacesare also positioned symmetrically around the circumference to providedynamic balancing. This provides balance to hole saw 10 important to arotary tool to limit/prevent shaking and vibration during use. Inaddition, this positioning ensures that one of the opening groups 32 or34 is generally facing the user regardless of the rotational positionwhen hole saw 10 stops spinning, allowing the user easy access throughone of openings 30 into internal area 26 for debris removal.

Still referring to FIG. 4, uninterrupted areas 36 have a circumferentiallength or width, W1, and each opening group 32 and 34 have acircumferential length or width, W2. As will be understood, the absolutevalue of W1 and W2 will vary based on the diameter of a particular holesaw and on the number of hole groups located around body 12. Inaddition, hole saw 10 may include more than two hole groups or holegroups with different numbers of holes as needed for different sizedhole saws. However, in specific embodiments, W1 and W2 are substantiallyequal to each other, and specifically are within 50%, more specificallywithin 30%, and even more specifically within 20% of each other.Applicant has found that this relative sizing between uninterruptedareas 36 and opening groups 32 and 34 provides balance, sufficientstrength and easy debris removal access to hollow internal area 26.Further, this relative sizing ensures that uninterrupted areas 36 arealso large enough to provide areas to place logos or productinformation.

In various embodiments, each opening group includes a plurality ofopenings that are distributed both in the circumferential/widthdirection and in the longitudinal direction. In general, Applicant hasfound that an arrangement including multiple openings within eachopening group 32 and 34 provides sufficient interior access for debrisremoval while also ensuring sufficient metal material is located withinthe area including the hole group to provide structural support to thehole saw. In addition to debris removal, in at least some of theembodiments discussed herein, hole saw 10 includes two or more holegroups extending around at least 50% of the circumference of hole saw10. In other words, in such arrangements, the sum of W2 for all holegroups is greater than 50% of the circumference of hole saw 10. Suchhole patterns allow for chip ejection around at least 50% of thecircumference of the hole saw. Because chips are developed all aroundthe circumference of the hole saw during cutting, the hole patternsdiscussed herein provide areas for chip ejection around a significantportion of the hole saw circumference, which is believed to improve holesaw performance.

In the specific embodiment shown in FIG. 4, each opening group 32 and 34includes three openings, opening 40, opening 42 and opening 44. In thisparticular arrangement, openings 40 and 42 have the same shape as eachother. Opening 40 is located closer to cutting teeth 20 than opening 42,and openings 40 and 42 are offset from each other in thecircumferential/width direction such that an uninterrupted portion 46 ofbody 12 is located in the width direction between openings 40 and 42. Inthis arrangement, no portion of opening 40 is located between opening 42and the cutting teeth in the longitudinal direction. In the specificembodiment shown, openings 40 and 42 are hexagonal in shape.

Opening 44 is smaller than both openings 40 and 42. In the specificembodiment shown, opening 44 has a shape that matches the shape of alower portion of openings 40 and 42. Opening 44 is aligned with opening42 in the longitudinal direction, and is located between cutting teeth20 and opening 42. Applicant has found that by providing openings ofvarious shapes and positioning within each opening group easy debrisremoval access to interior 26 is provided. In alternative embodiments,opening groups 32 and 34 do not include the smaller opening 44, and onlyinclude openings 40 and 42.

Specifically, within each opening group 32 and 34, Applicant hasdetermined that a ratio of open area to solid area relates to thebalance between debris removal and strength. In specific embodiments,the total area of opening groups is determined by W2 times thelongitudinal length of body 12, where W2 is the circumferential lengthor width measured between widest lateral edges of openings within thegroup. In various embodiments, the ratio of the area of openings withineach group to the total group area is between 20% and 80% and morespecifically is between 40% and 60%.

In addition to the shape and distribution within each opening group,openings 40, 42 and 44 are sized and shaped to allow for easy insertionof a tool (e.g., a screw driver) through the openings to facilitateremoving or prying of a plug or other cutting debris from interior 26.Thus, the upper and lower edges of openings 40, 42 and/or 44 having acircumferential length or width, W3, that is large enough to permitinsertion of a standard flat head screw driver. Openings 40, 42 and 44are also shaped such that their width dimension increases tocircumferential length or width, W4, that is greater than W3. In variousembodiments, W4 is between 125% of W3 and 300% of W3 and specifically W4is two times W3. In a specific embodiment, W3 is between 0.25 inches and0.5 inches.

In various embodiments, hole groups 32 and 34 are positioned relative tocutting teeth 20 and to end cap 16 to improve performance of hole saw10. For example, the lowest edge of the lowest hole of each hole groupis spaced a short distance D1 from the weld joining end cap 16 to body12. For example, D1 is a small distance to allow a tool to be insertedbehind debris located adjacent end cap 16 within hole saw 10 tofacilitate removal of the debris. In specific embodiments, D1 is between1/16^(th) of an inch and ½ inch, specifically is between 2/16^(th) of aninch and 4/16^(th) of an inch and more specifically is 3/16^(th) of aninch.

As another example, the highest edge of the highest hole of each holegroup is spaced a distance D2 from the valley or gullet between adjacentcutting teeth. In general, Applicant has determined that if D2 is toosmall the cutting teeth can be damaged or experience high wear duringuse and/or an undesirable degree of heat can be built up at the cuttingedge of the hole saw. In specific embodiments, D2 is between 1/32^(nd)of an inch and 1 inch, specifically is between 1/32^(nd) inch and3/16^(th) of an inch and more specifically is ¼^(th) of an inch.

Referring to FIGS. 5-7, a hole saw 100 is shown according to anexemplary embodiment. Hole saw 100 is substantially the same as hole saw10 except for the differences discussed herein. In general, hole saw 100includes more opening groups and more openings within each group thanhole saw 10. In specific embodiments, hole saw 100 has a larger diameterthan hole saw 10 with the increased number of holes accounting for thelarger size.

As shown in FIG. 7, hole saw 100 includes three opening groups, groups102, 104 and 106. Each opening group 102, 104 and 106 is separated fromadjacent groups via uninterrupted areas 36. Groups 102, 104 and 106 aresubstantially evenly spaced such that one group is located within each120 degree section around the circumference of hole saw 100.

Each opening group 102, 104 and 106 has six openings rather than thethree opening groups of hole saw 10. In particular, in addition toopenings 40, 42 and 44, each group 102, 104 and 106 include openings110, 112 and 114. As can be seen in FIG. 7, opening 110 has the sameshape as openings 40 and 42 and is aligned with opening 40 in thecircumferential direction and is spaced from both openings 40 and 42 inthe circumferential/width direction.

Openings 112 and 114 have the same shape as opening 44. Openings 112 and114 are located further from cutting teeth 20 than opening 44. Further,opening 112 is located on one side of opening 42 in thecircumferential/width direction and opening 114 is located on the otherside of opening 42 in the circumferential/width direction. In thespecific embodiment shown, opening 112 is aligned with opening 110 inthe longitudinal direction and is located between opening 110 and endcap 16. Similarly, in the specific embodiment shown, opening 114 isaligned with opening 40 in the longitudinal direction and is locatedbetween opening 40 and end cap 16.

In various embodiments, the number of opening groups located around thehole saw body changes based on the size of the hole saw. In variousembodiments, the number of openings within each opening group and/or thesize of each opening increase as the size of the hole saw increases. Ina specific embodiment both the number of hole groups and the relativewidth of the hole group, W2, to the width of the solid space, W1,increases as the diameter of the hole saw increases. In specificembodiments, a three inch diameter hole saw includes three hole groupsand three space solid areas. In specific embodiments, a four inchdiameter hole saw includes four hole groups and four space solid areas.In addition, as shown in the embodiment of FIG. 7, W2 is greater than W1and specifically is between 1 and 2 times W1. In some embodiments, W2 isgreater than W1, specifically W2 is greater than 1.5 times W1, greaterthan 2.5 times W1 or greater than 3 times W1. In a specific embodiment,the diameter of the hole saw is six inches and W2 is 3.5 times W1.

Referring to FIG. 8, a hole saw 200 is shown according to an exemplaryembodiment. Hole saw 200 is substantially the same as hole saw 10 andhole saw 100 except for the differences discussed herein. In general,hole saw 200 includes the same number of opening groups as hole saw 10and the same number of openings within each opening group as hole saw100.

As shown in FIG. 8, hole saw 200 includes two opening groups, groups 202and 204. Each opening group 202 and 204 is separated from adjacentopening groups via uninterrupted areas 36. Opening groups 202 and 204are evenly spaced such that one opening group is located within each 180degree section around the circumference of hole saw 200.

Each opening group 202 and 204 has six openings, similar to hole saw100. In particular, each opening group 202 and 204 includes openings210, 212, 214, 216, 218, and 220. As can be seen in FIG. 8, opening 210has a shape of a first rectangle. Openings 216 and 218 have the sameshape as opening 210. Opening 212 has a shape of a second rectangle,with a smaller height than, and a same width as, the first rectangle.Openings 214 and 220 have the same shape as opening 212. Opening 210 isaligned with opening 218 in the circumferential direction and is spacedfrom both openings 216 and 218 in the circumferential/width direction.Openings 212, 216, and 220 are located further from cutting teeth 20than openings 210, 214, and 218.

Further, opening 210 is located on one side of opening 214 in thecircumferential/width direction, and opening 218 is located on the otherside of opening 214 in the circumferential/width direction. Similarly,opening 212 is located on one side of opening 216 in thecircumferential/width direction, and opening 220 is located on the otherside of opening 216 in the circumferential/width direction. In thespecific embodiment shown, opening 212 is aligned with opening 210 inthe longitudinal direction and is located between opening 210 and endcap16. Similarly, in the specific embodiment shown, opening 216 is alignedwith opening 214 in the longitudinal direction and is located betweenopening 214 and endcap 16. Similarly, in the specific embodiment shown,opening 220 is aligned with opening 218 in the longitudinal directionand is located between opening 218 and endcap 16.

Referring to FIG. 9, a hole saw 300 is shown according to an exemplaryembodiment. Hole saw 300 is substantially the same as hole saw 10 exceptfor the differences discussed herein. In general, hole saw 300 includesthe same number of opening groups, and the same number of openingswithin each opening group, as hole saw 10.

As shown in FIG. 9, hole saw 300 includes two opening groups, groups 302and 304. Each opening group 302 and 304 is separated from adjacentopening groups via uninterrupted areas 36. Opening groups 302 and 304are evenly spaced such that one opening group is located within each 180degree section around the circumference of hole saw 300.

Each opening group 302 and 304 has three openings. In particular, eachopening group 302 and 304 includes openings 310, 312, and 314. As can beseen in FIG. 9, opening 310 has a shape of a triangle. Openings 312 and314 have the same shape as opening 310. In a specific embodiment,openings 310, 312, and 314 each have a shape of an equilateral triangle.Opening 312 is aligned with opening 314 in the circumferential/widthdirection and is spaced from both openings 310 and 314 in thecircumferential/width direction. Openings 312 and 314 are locatedfurther from cutting teeth 20 than is opening 310.

In the specific embodiment shown, openings 310, 312, and 314 each has anapex point facing towards cutting teeth 20. The apex point of opening310 is positioned midway between the apex points of openings 312 and314. Opening 310 is aligned in the longitudinal direction with openings312 and 314. Openings 312 and 314 are located between opening 310 andendcap 16.

Referring to FIG. 10, a hole saw 400 is shown according to an exemplaryembodiment. Hole saw 400 is substantially the same as hole saw 10 exceptfor the differences discussed herein. In general, hole saw 400 includesthe same number of opening groups, and the same number of openingswithin each opening group, as hole saw 10.

As shown in FIG. 10, hole saw 400 includes two opening groups, groups402 and 404. Each opening group 402 and 404 is separated from adjacentopening groups via uninterrupted areas 36. Opening groups 402 and 404are evenly spaced such that one opening group is located within each 180degree section around the circumference of hole saw 400.

Each opening group 402 and 404 has three openings. In particular, eachopening group 402 and 404 includes openings 410, 412, and 414. As can beseen in FIG. 10, opening 410 has a shape of a pentagon. Openings 412 and414 have the same shape as opening 410. In a specific embodiment,openings 410, 412, and 414 each have a shape of an equilateral pentagon.Opening 412 is aligned with opening 414 in the circumferential/widthdirection and is spaced from both openings 410 and 414 in thecircumferential/width direction. Openings 412 and 414 are locatedfurther from cutting teeth 20 than opening 410.

In the specific embodiment shown, openings 410, 412, and 414 each has anapex point facing towards cutting teeth 20. The apex point of opening410 is positioned midway between the apex points of openings 412 and414. Opening 410 is aligned in the longitudinal direction with openings412 and 414. Openings 412 and 414 are located between opening 410 andendcap 16.

Referring to FIG. 11, a hole saw 500 is shown according to an exemplaryembodiment. Hole saw 500 is substantially the same as hole saw 10 andhole saw 100 except for the differences discussed herein. In general,hole saw 500 includes the same number of opening groups as hole saw 10and the same number of openings within each opening group as hole saw100.

As shown in FIG. 11, hole saw 500 includes two opening groups, groups502 and 504. Each opening group 502 and 504 is separated from adjacentopening groups via uninterrupted areas 36. Opening groups 502 and 504are evenly spaced such that one opening group is located within each 180degree section around the circumference of hole saw 500.

Each opening group 502 and 504 has six openings, similar to hole saw100. In particular, each opening group 502 and 504 includes openings510, 512, 514, 516, 518, and 520. As can be seen in FIG. 11, opening 510has a shape of a first parallelogram leaning upwards and right. In aspecific embodiment, opening 510 has a shape of a first rhomboid.Openings 516 and 518 have the same shape as opening 510. Opening 512 hasa shape of a second parallelogram leaning upwards and right, with a samewidth and a smaller height than the first parallelogram. In a specificembodiment, opening 512 has a shape of a second rhomboid. Openings 514and 520 have the same shape as opening 512. Opening 510 is aligned withopening 518 in the circumferential direction and is spaced from bothopenings 516 and 518 in the circumferential/width direction. Openings512, 516, and 520 are located further from cutting teeth 20 than areopenings 510, 514, and 518.

Further, opening 510 is located on one side of opening 514 in thecircumferential/width direction, and opening 518 is located on the otherside of opening 514 in the circumferential/width direction. Similarly,opening 512 is located on one side of opening 516 in thecircumferential/width direction, and opening 520 is located on the otherside of opening 516 in the circumferential/width direction. In thespecific embodiment shown, opening 512 is aligned with opening 510 in adiagonal direction of hole saw 500 and is located between opening 510and endcap 16. Similarly, in the specific embodiment shown, opening 516is aligned with opening 514 in the same diagonal direction as openings510 and 512, and is located between opening 514 and endcap 16.Similarly, in the specific embodiment shown, opening 520 is aligned withopening 518 in the same diagonal direction as openings 510 and 512, andis located between opening 518 and endcap 16.

Referring to FIG. 12, a hole saw 600 is shown according to an exemplaryembodiment. Hole saw 600 is substantially the same as hole saw 10 andhole saw 100 except for the differences discussed herein. In general,hole saw 600 includes the same number of opening groups as hole saw 10and more openings within each opening group than both hole saw 10 andhole saw 100.

As shown in FIG. 12, hole saw 600 includes two opening groups, groups602 and 604. Each opening group 602 and 604 is separated from adjacentopening groups via uninterrupted areas 36. Opening groups 602 and 604are evenly spaced such that one opening group is located within each 180degree section around the circumference of hole saw 600.

Each opening group 602 and 604 has nine openings, rather than the threeopenings of hole saw 10 or the six openings of hole saw 100. Inparticular, each opening group 602 and 604 includes openings 610, 612,614, 616, 618, 620, 622, 624, and 626. As can be seen in FIG. 12,opening 610 has a shape of a parallelogram leaning upwards and right. Ina specific embodiment, opening 610 has a shape of a rhomboid. Openings612, 614, 616, 618, 620, 622, 624, and 626 have the same shape asopening 610. Opening 610 is aligned with openings 616 and 622 in thecircumferential direction and is spaced from both openings 612 and 616in the circumferential/width direction. Openings 610, 616, and 622 arelocated nearest the cutting teeth 20. Openings 612, 618, and 624 arelocated midway respectively between openings 610, 616, and 622 andopenings 614, 620, and 626, which are nearest the endcap 16.

Further, opening 610 is located on one side of opening 616 in thecircumferential/width direction, and opening 622 is located on the otherside of opening 616 in the circumferential/width direction. Similarly,opening 612 is located on one side of opening 618 in thecircumferential/width direction, and opening 624 is located on the otherside of opening 618 in the circumferential/width direction. Similarly,opening 614 is located on one side of opening 620 in thecircumferential/width direction, and opening 626 is located on the otherside of opening 620 in the circumferential/width direction. In thespecific embodiment shown, openings 612 and 614 are aligned with opening610 in a diagonal direction of hole saw 600.

Similarly, in the specific embodiment shown, openings 618 and 620 isaligned with opening 616 in the same diagonal direction as openings 610,612, and 614. Similarly, in the specific embodiment shown, openings 624and 626 are aligned with opening 622 in the same diagonal direction asopenings 610, 612, and 614.

Referring to FIG. 13, a hole saw 700 is shown according to an exemplaryembodiment. Hole saw 700 is substantially the same as hole saw 10 andhole saw 100 except for the differences discussed herein. In general,hole saw 700 includes the same number of opening groups as hole saw 10and more openings within each opening group than both hole saw 10 andhole saw 100.

As shown in FIG. 13, hole saw 700 includes two opening groups, groups702 and 704. Each opening group 702 and 704 is separated from adjacentopening groups via uninterrupted areas 36. Opening groups 702 and 704are evenly spaced such that one opening group is located within each 180degree section around the circumference of hole saw 700.

Each opening group 702 and 704 has eight openings, rather than the threeopenings of hole saw 10 or the six openings of hole saw 100. Inparticular, each opening group 702 and 704 includes openings 710, 712,714, 716, 718, 720, 722, and 724. As can be seen in FIG. 13, opening 710has a shape of a parallelogram leaning upwards and right. In a specificembodiment, opening 710 has a shape of a rhomboid. Openings 710, 712,714, 716, 718, 720, 722, and 724 have the same shape as opening 710.Opening 710 is aligned with openings 716 and 722 in thecircumferential/width direction. Openings 710, 716, and 722 are locatednearest the cutting teeth 20. Openings 712 and 718 are located along thelongitudinal direction midway between openings 710, 716, and 722 andopenings 714, 720, and 724, which are nearest the endcap 16. Openings712 and 718 are staggered midway centrally along the circumference ofhole saw 700 between openings 710, 716, and 722 and openings 714, 720,and 724.

Further, opening 710 is located on one side of opening 716 in thecircumferential/width direction, and opening 722 is located on the otherside of opening 716 in the circumferential/width direction. Similarly,opening 714 is located on one side of opening 720 in thecircumferential/width direction, and opening 724 is located on the otherside of opening 720 in the circumferential/width direction. In thespecific embodiment shown, opening 714 is aligned with opening 710 in adiagonal direction of hole saw 700. Similarly, in the specificembodiment shown, opening 716 is aligned with opening 720 in the samediagonal direction as openings 710 and 714. Similarly, in the specificembodiment shown, opening 722 is aligned with opening 724 in the samediagonal direction as openings 710 and 714.

Referring to FIG. 14, a hole saw 800 is shown according to an exemplaryembodiment. Hole saw 800 is substantially the same as hole saw 10 andhole saw 100 except for the differences discussed herein. In general,hole saw 800 includes the same number of opening groups as hole saw 10and more openings within each opening group than both hole saw 10 andhole saw 100.

As shown in FIG. 14, hole saw 800 includes two opening groups, groups802 and 804. Each opening group 802 and 804 is separated from adjacentopening groups via uninterrupted areas 36. Opening groups 802 and 804are evenly spaced such that one opening group is located within each 180degree section around the circumference of hole saw 800.

Each opening group 802 and 804 has nine openings, rather than the threeopenings of hole saw 10 or the six openings of hole saw 100. Inparticular, each opening group 802 and 804 includes openings 810, 812,814, 816, 818, 820, 822, 824, and 826. As can be seen in FIG. 14,opening 810 has a shape of a parallelogram leaning upwards and right. Ina specific embodiment, opening 810 has a shape of a rhomboid. Openings812, 814, 816, 818, 820, 822, 824, and 826 have the same shape asopening 810. Opening 810 is aligned with openings 816 and 822 in thecircumferential/width. Openings 810, 816, and 822 are located nearestthe cutting teeth 20. Openings 812, 818, and 824 are located midwayrespectively between openings 810, 816, and 822 and openings 814, 820,and 826, which are nearest the endcap 16. Openings 812, 818, and 824 arestaggered midway to the left along the circumference of hole saw 800between openings 810, 816, and 822 and openings 814, 820, and 826.

Further, opening 810 is located on one side of opening 816 in thecircumferential/width direction, and opening 822 is located on the otherside of opening 816 in the circumferential/width direction. Similarly,opening 812 is located on one side of opening 818 in thecircumferential/width direction, and opening 824 is located on the otherside of opening 818 in the circumferential/width direction. Similarly,opening 814 is located on one side of opening 820 in thecircumferential/width direction, and opening 826 is located on the otherside of opening 820 in the circumferential/width direction. In thespecific embodiment shown, opening 814 is aligned with opening 810 in adiagonal direction of hole saw 800. Similarly, in the specificembodiment shown, opening 820 is aligned with opening 816 in the samediagonal direction as openings 810 and 814. Similarly, in the specificembodiment shown, opening 826 is aligned with opening 822 in the samediagonal direction as openings 810 and 814.

Referring to FIG. 15, a hole saw 900 is shown according to an exemplaryembodiment. Hole saw 900 is substantially the same as hole saw 10 andhole saw 100 except for the differences discussed herein. In general,hole saw 900 includes the same number of opening groups as hole saw 10and the same number of openings within each opening group as hole saw100.

As shown in FIG. 15, hole saw 900 includes two opening groups, groups902 and 904. Each opening group 902 and 904 is separated from adjacentopening groups via uninterrupted areas 36. Opening groups 902 and 904are evenly spaced such that one opening group is located within each 180degree section around the circumference of hole saw 900.

Each opening group 902 and 904 has six openings, rather than the threeopenings of hole saw 10. In particular, each opening group 902 and 904includes openings 910, 912, 914, 916, 918, and 920. As can be seen inFIG. 15, opening 910 has a shape of a parallelogram leaning upwards andright. In a specific embodiment, opening 910 has a shape of a rhomboid.Openings 910, 912, 914, 916, 918, and 920 have the same shape as opening910. Opening 910 is aligned with opening 916 in thecircumferential/width direction. Openings 910 and 916 are locatednearest the cutting teeth 20. Openings 912 and 918 are located midwayrespectively between openings 910 916 and openings 914 and 920, whichare nearest the endcap 16. Openings 912 and 918 are staggered midway tothe left along the circumference of hole saw 900 between openings 910and 916 and openings 914 and 920.

In the specific embodiment shown, opening 914 is aligned with opening910 in a diagonal direction of hole saw 900. Similarly, in the specificembodiment shown, opening 920 is aligned with opening 916 in the samediagonal direction as openings 910 and 914.

Referring to FIG. 16, a hole saw 1000 is shown according to an exemplaryembodiment. Hole saw 1000 is substantially the same as hole saw 10except for the differences discussed herein. In general, hole saw 1000includes the same number of opening groups, and the same number ofopenings within each opening group, as hole saw 10.

As shown in FIG. 16, hole saw 1000 includes two opening groups, groups1002 and 1004. Each opening group 1002 and 1004 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1002and 1004 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1000.

Each opening group 1002 and 1004 has three openings. In particular, eachopening group 1002 and 1004 includes openings 1010, 1012, and 1014. Ascan be seen in FIG. 16, opening 1010 has a shape of a triangle. In aspecific embodiment, opening 1010 has a shape of a scalene triangle.Opening 1014 has the same shape as opening 1010. Opening 1010 ispositioned nearest the cutting teeth 20, and has a base facing thecutting teeth 20, and an apex point facing endcap 16. Opening 1010 has ahypotenuse facing opening 1012. Opening 1014 is positioned nearestendcap 16, and has a base facing endcap 16, and an apex point facing thecutting teeth 20. Opening 1014 has a hypotenuse facing opening 1012.Neither opening 1010 nor opening 1014 extends along the fulllongitudinal direction of hole saw 1000. Opening 1012 has a shape of aparallelogram leaning upwards and right. In a specific embodiment,opening 1012 has a shape of a rhomboid. Opening 1012 extends fully alonga diagonal direction of hole saw 1000. Opening 1010 is located on oneside of opening 1012, and opening 1014 is located on the other side ofopening 1012.

Referring to FIG. 17, a hole saw 1100 is shown according to an exemplaryembodiment. Hole saw 1100 is substantially the same as hole saw 10except for the differences discussed herein. In general, hole saw 1100includes the same number of opening groups as hole saw 10 and a greaternumber of openings within each opening group as hole saw 10.

As shown in FIG. 17, hole saw 1100 includes two opening groups, groups1102 and 1104. Each opening group 1102 and 1104 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1102and 1104 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1100.

Each opening group 1102 and 1104 has four openings, rather than thethree openings of hole saw 10. In particular, each opening group 1102and 1104 includes openings 1110, 1112, 1114, and 1116. As can be seen inFIG. 17, opening 1110 has a shape of a semicircle. Opening 1116 has thesame shape as opening 1110. Opening 1112 has a shape of an ellipse, withlarger dimensions than the semicircle. Opening 1114 has the same shapeas opening 1112. Opening 1110 is aligned with opening 1114 in thecircumferential direction and is spaced from both openings 1112 and 1114in the circumferential/width direction. Openings 1112 and 1116 arelocated further from cutting teeth 20 than are openings 1110 and 1114.

Opening 1110 has a flat end facing towards endcap 16. Opening 1116 has aflat end facing towards the cutting teeth 20. Openings 1112 and 1114both have a major axis aligned in the longitudinal direction. Opening1110 and opening 1114 each has a tangent end that are alignedcircumferentially facing the cutting teeth 20. Similarly, opening 1112and opening 1116 each has a tangent end that are alignedcircumferentially facing endcap 16.

In the specific embodiment shown, opening 1112 is aligned with opening1110 in the longitudinal direction and is located between opening 1110and endcap 16. Similarly, in the specific embodiment shown, opening 1116is aligned with opening 1114 in the longitudinal direction and islocated between opening 1114 and endcap 16.

Referring to FIG. 18, a hole saw 1200 is shown according to an exemplaryembodiment. Hole saw 1200 is substantially the same as hole saw 1100except for the differences discussed herein. In general, hole saw 1100includes the same number of opening groups, and the same number ofopenings within each group opening, as hole saw 1100.

As shown in FIG. 18, hole saw 1200 includes two opening groups, groups1202 and 1204. Each opening group 1202 and 1204 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1202and 1204 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1200.

Each opening group 1202 and 1204 has four openings, similar to the fouropenings of hole saw 1100. In particular, each opening group 1202 and1204 includes openings 1210, 1212, 1214, and 1216. As can be seen inFIG. 18, opening 1210 has a shape of a first ellipse. Opening 1216 hasthe same shape as opening 1210. Opening 1212 has a shape of a secondellipse, with smaller dimensions than the first ellipse. Opening 1214has the same shape as opening 1212. Opening 1210 is aligned with opening1214 in the circumferential direction and is spaced from both openings1212 and 1214 in the circumferential/width direction. Openings 1212 and1216 are located further from cutting teeth 20 than are openings 1210and 1214.

Opening 1210 and opening 1216 each has a minor axis aligned in thelongitudinal direction. Openings 1112 and 1114 both have a major axisaligned in the longitudinal direction. The minor axis of opening 1210 isaligned longitudinally with the major axis of opening 1212, while theminor axis of opening 1216 is aligned longitudinally with the major axisof opening 1214.

Referring to FIG. 19, a hole saw 1300 is shown according to an exemplaryembodiment. Hole saw 1300 is substantially the same as hole saw 1100except for the differences discussed herein. In general, hole saw 1300includes the same number of opening groups, and the same number ofopenings within each opening group, as hole saw 1100.

As shown in FIG. 19, hole saw 1300 includes two opening groups, groups1302 and 1304. Each opening group 1302 and 1304 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1302and 1304 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1300.

Each opening group 1302 and 1304 has four openings, similar to the fouropenings of hole saw 1100. In particular, each opening group 1302 and1304 includes openings 1310, 1312, 1314, and 1316. As can be seen inFIG. 19, opening 1310 has a shape of a hexagon. Opening 1316 has thesame shape as opening 1110. Opening 1312 has a shape of a semi-hexagonwith smaller dimensions than the hexagon, and has rounded corners, arounded base edge, and a rounded top edge. Opening 1314 has the sameshape as opening 1312. The rounded base edge of opening 1312 facestowards endcap 16, and the rounded top edge of opening 1312 facestowards cutting teeth 20. The rounded base edge of opening 1314 facestowards cutting teeth 20, and the rounded top edge of opening 1314 facestowards endcap 16. Opening 1310 is aligned with opening 1314 in thecircumferential direction and is spaced from both openings 1312 and 1314in the circumferential/width direction. Openings 1312 and 1316 arelocated further from cutting teeth 20 than are openings 1310 and 1314.

In the specific embodiment shown, opening 1312 is aligned with opening1310 in the longitudinal direction and is located between opening 1310and endcap 16. Similarly, in the specific embodiment shown, opening 1316is aligned with opening 1314 in the longitudinal direction and islocated between opening 1314 and endcap 16.

Referring to FIG. 20, a hole saw 1400 is shown according to an exemplaryembodiment. Hole saw 1400 is substantially the same as hole saw 10except for the differences discussed herein. In general, hole saw 1400includes the same number of opening groups as hole saw 10 and a greaternumber of openings within each opening group than hole saw 10.

As shown in FIG. 20, hole saw 1400 includes two opening groups, groups1402 and 1404. Each opening group 1402 and 1404 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1402and 1404 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1400.

Each opening group 1402 and 1404 has four openings, rather than thethree openings of hole saw 10. In particular, each opening group 1402and 1404 includes openings 1410, 1412, 1414, and 1416. As can be seen inFIG. 20, opening 1410 has a shape of a first rectangle. Opening 1416 hasthe same shape as opening 1410. Opening 1412 has a shape of a secondrectangle, with a smaller height than, and a same width as, the firstrectangle. Opening 1414 has the same shape as opening 1412. Opening 1410is spaced from both openings 1412 and 1414 in the circumferential/widthdirection. Openings 1412 and 1416 are located further from cutting teeth20 than are openings 1410 and 1414.

In the specific embodiment shown, opening 1412 is aligned with opening1410 in the longitudinal direction and is located between opening 1410and endcap 16. Similarly, in the specific embodiment shown, opening 1416is aligned with opening 1414 in the longitudinal direction and islocated between opening 1414 and endcap 16.

Referring to FIG. 21, a hole saw 1500 is shown according to an exemplaryembodiment. Hole saw 1500 is substantially the same as hole saw 10except for the differences discussed herein. In general, hole saw 1500includes the same number of opening groups as hole saw 10 and feweropenings within each opening group as hole saw 10.

As shown in FIG. 21, hole saw 1500 includes two opening groups, groups1502 and 1504. Each opening group 1502 and 1504 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1502and 1504 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1500.

Each opening group 1502 and 1504 has two openings, rather than the threeopenings of hole saw 10. In particular, each opening group 1502 and 1504includes openings 1510 and 1512. As can be seen in FIG. 21, opening 1510has a shape of a slot. Opening 1512 has the same shape as opening 1510.Opening 1510 and opening 1512 each has a pair of tangential ends, with afirst tangential end facing towards the cutting teeth 20, and a secondtangential end facing towards endcap 16. Openings 1510 and 1512 each hasa major axis positioned longitudinally between the cutting teeth 20 andendcap 16. Opening 1510 has a minor axis aligned horizontally with thefirst tangential end of opening 1512. Opening 1512 has a minor axisaligned horizontally with the second tangential end of opening 1510.Opening 1510 is spaced from opening 1512 in the circumferential/widthdirection.

Referring to FIG. 22, a hole saw 1600 is shown according to an exemplaryembodiment. Hole saw 1600 is substantially the same as hole saw 1500except for the differences discussed herein. In general, hole saw 1600includes the same number of opening groups, and the same number ofopenings within each opening group, as hole saw 1500.

As shown in FIG. 22, hole saw 1600 includes two opening groups, groups1602 and 1604. Each opening group 1602 and 1604 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1602and 1604 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1600.

Each opening group 1602 and 1604 has two openings, similar to hole saw1500. In particular, each opening group 1602 and 1604 includes openings1610 and 1612. As can be seen in FIG. 22, opening 1610 has a shape of aprofile. Opening 1612 has the same shape as opening 1510. Opening 1610and opening 1612 each has a flat edge facing towards the cutting teeth20, a pair of parallel edges aligned longitudinally, and an arcuate edgefacing towards endcap 16. Opening 1612 is staggered longitudinally andcircumferentially with respect to opening 1610, with its arcuate edgecloser to endcap 16, and its flat edge further from the cutting teeth20. Opening 1610 is spaced from opening 1612 in thecircumferential/width direction.

Referring to FIG. 23, a hole saw 1700 is shown according to an exemplaryembodiment. Hole saw 1700 is substantially the same as hole saw 1500except for the differences discussed herein. In general, hole saw 1700includes the same number of opening groups, and the same number ofopenings within each opening group, as hole saw 1500.

As shown in FIG. 23, hole saw 1700 includes two opening groups, groups1702 and 1704. Each opening group 1702 and 1704 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1702and 1704 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1700.

Each opening group 1702 and 1704 has two openings, similar to hole saw1500. In particular, each opening group 1702 and 1704 includes openings1710 and 1712. As can be seen in FIG. 23, opening 1710 has a shape of anellipse. Opening 1712 has the same shape as opening 1710. Opening 1710and opening 1712 each has a pair of tangential ends, with a firsttangential end facing towards the cutting teeth 20, and a secondtangential end facing towards endcap 16. Openings 1710 and 1712 each hasa major axis positioned longitudinally between the cutting teeth 20 andendcap 16. Opening 1710 has a minor axis aligned horizontally with thefirst tangential end of opening 1712. Opening 1712 has a minor axisaligned horizontally with the second tangential end of opening 1710.Opening 1710 is spaced from opening 1712 in the circumferential/widthdirection.

Referring to FIG. 24, a hole saw 1800 is shown according to an exemplaryembodiment. Hole saw 1800 is substantially the same as hole saw 10except for the differences discussed herein. In general, hole saw 1800includes the same number of opening groups, and the same number ofopenings within each opening group, as hole saw 10.

As shown in FIG. 24, hole saw 1800 includes two opening groups, groups1802 and 1804. Each opening group 1802 and 1804 is separated fromadjacent opening groups via uninterrupted areas 36. Opening groups 1802and 1804 are evenly spaced such that one opening group is located withineach 180 degree section around the circumference of hole saw 1800.

Each opening group 1802 and 1804 has three openings. In particular, eachopening group 1802 and 1804 includes openings 1810, 1812, and 1814. Ascan be seen in FIG. 24, opening 1810 has a shape of a first slot.Opening 1814 has the same shape as opening 1810. Opening 1812 has ashape of a second slot, with smaller dimensions than the first slot.Opening 1810 is spaced from openings 1812 and 1814 in thecircumferential/width direction. Opening 1810 is positioned closer toopening 1812 than opening 1812 is to opening 1814. Openings 1810, 1812,and 1814 each has a pair of tangential ends, with a first tangential endfacing the cutting teeth 20 and a second tangential end facing endcap16. Openings 1810, 1812, and 1814 each has a major axis alignedlongitudinally between the cutting teeth 20 and endcap 16. Opening 1810has a center positioned midway between the cutting teeth 20 and endcap16. Opening 1812 has a center positioned closer to the cutting teeth 20.Opening 1814 has a center positioned closer to endcap 16.

Referring to FIG. 25, a hole saw 1900 is shown according to an exemplaryembodiment. Hole saw 1900 is substantially the same as hole saw 10except for the differences discussed herein. In general, hole saw 1900includes more opening groups, and fewer openings within each openinggroup, as hole saw 10.

As shown in FIG. 25, hole saw 1900 includes four opening groups, groups1902, 1904, 1906, and 1908. Each opening group 1902, 1904, 1906, and1908 is separated from adjacent opening groups via uninterrupted areas36. Opening groups 1902, 1904, 1906, and 1908 are evenly spaced suchthat one opening group is located within each 90 degree section aroundthe circumference of hole saw 1900.

Each opening group 1902, 1904, 1906, and 1908 has one opening. Inparticular, each opening group 1902, 1904, 1906, and 1908 includesopening 1910. As can be seen in FIG. 25, opening 1910 has a shape of anellipse. Opening 1910 has a pair of tangential ends, with a firsttangential end facing towards the cutting teeth 20, and a secondtangential end facing towards endcap 16. Opening 1910 has a major axispositioned longitudinally between the cutting teeth 20 and endcap 16.

Referring to FIG. 26, a hole saw 2000 is shown according to an exemplaryembodiment. Hole saw 2000 is substantially the same as hole saw 10except for the differences discussed herein. In general, hole saw 2000includes fewer opening groups than hole saw 10, and fewer openingswithin each opening group than hole saw 10.

As shown in FIG. 26, hole saw 2000 includes one opening group, group2002. Opening group 2002 is located within a section around thecircumference of hole saw 2000.

Opening group 2002 has one opening. In particular, opening group 2002includes opening 2010. As can be seen in FIG. 26, opening 2010 has ashape of a slot. The slot of opening 2010 has a first tangent endleaning upward and left towards cutting teeth 20, and a second tangentend leaning downward and right towards endcap 16.

It should be understood that the figures illustrate the exemplaryembodiments in detail, and it should be understood that the presentapplication is not limited to the details or methodology set forth inthe description or illustrated in the figures. It should also beunderstood that the terminology is for the purpose of description onlyand should not be regarded as limiting.

Further modifications and alternative embodiments of various aspects ofthe invention will be apparent to those skilled in the art in view ofthis description. Accordingly, this description is to be construed asillustrative only. The construction and arrangements, shown in thevarious exemplary embodiments, are illustrative only. Although only afew embodiments have been described in detail in this disclosure, manymodifications are possible (e.g., variations in sizes, dimensions,structures, shapes and proportions of the various elements, values ofparameters, mounting arrangements, use of materials, colors,orientations, etc.) without materially departing from the novelteachings and advantages of the subject matter described herein. Someelements shown as integrally formed may be constructed of multiple partsor elements, the position of elements may be reversed or otherwisevaried, and the nature or number of discrete elements or positions maybe altered or varied. The order or sequence of any process, logicalalgorithm, or method steps may be varied or re-sequenced according toalternative embodiments. Other substitutions, modifications, changes andomissions may also be made in the design, operating conditions andarrangement of the various exemplary embodiments without departing fromthe scope of the present invention.

Unless otherwise expressly stated, it is in no way intended that anymethod set forth herein be construed as requiring that its steps beperformed in a specific order. Accordingly, where a method claim doesnot actually recite an order to be followed by its steps or it is nototherwise specifically stated in the claims or descriptions that thesteps are to be limited to a specific order, it is in no way intendedthat any particular order be inferred. In addition, as used herein thearticle “a” is intended to include one or more than one component orelement, and is not intended to be construed as meaning only one.

For purposes of this disclosure, the term “coupled” means the joining oftwo components directly or indirectly to one another. Such joining maybe stationary in nature or movable in nature. Such joining may beachieved with the two members and any additional intermediate membersbeing integrally formed as a single unitary body with one another, orwith the two members and any additional member being attached to oneanother. Such joining may be permanent in nature or alternatively may beremovable or releasable in nature. Various embodiments of the inventionrelate to any combination of any of the features, and any suchcombination of features may be claimed in this or future applications.Any of the features, elements, or components of any of the exemplaryembodiments discussed above may be utilized alone or in combination withany of the features, elements, or components of any of the otherembodiments discussed above.

In various exemplary embodiments, the relative dimensions, includingangles, lengths and radii, as shown in the Figures are to scale. Actualmeasurements of the Figures will disclose relative dimensions, anglesand proportions of the various exemplary embodiments. Various exemplaryembodiments extend to various ranges around the absolute and relativedimensions, angles and proportions that may be determined from theFigures. Various exemplary embodiments include any combination of one ormore relative dimensions or angles that may be determined from theFigures. Further, actual dimensions not expressly set out in thisdescription can be determined by using the ratios of dimensions measuredin the Figures in combination with the express dimensions set out inthis description. In addition, in various embodiments, the presentdisclosure extends to a variety of ranges (e.g., plus or minus 30%, 20%,or 10%) around any of the absolute or relative dimensions disclosedherein or determinable from the Figures.

What is claimed is:
 1. A hole saw comprising: a saw body having a firstedge located at a first end of the saw body and a second edge located ata second end opposite the first end, the saw body including an outersurface and an inner surface defining a hollow internal area; cuttingteeth extending from the first end of the saw body; an end cap coupledto the second end of the saw body, the end cap including a hub; an arborconfigured to couple the hole saw to a driving tool, the arbor coupledto the hub and extending outward from the end cap in a directionopposite from the cutting teeth; and a group of openings extendingbetween the outer surface and the inner surface of the saw body, whereinthe group of openings comprises: a first discrete opening having a firstshape; and a second discrete opening having a second shape; wherein thesecond discrete opening is smaller than the first discrete opening;wherein the second shape of the second discrete opening matches a lowerportion of the first shape of the first discrete opening.
 2. The holesaw of claim 1, wherein the second discrete opening is aligned with thefirst discrete opening in a longitudinal direction such that the seconddiscrete opening is between the first discrete opening and the cuttingteeth and both first and second shapes are symmetrical in acircumferential direction.
 3. The hole saw of claim 2, wherein the firstshape is symmetrical in the longitudinal direction.
 4. The hole saw ofclaim 1, wherein, in a longitudinal direction, the second discreteopening is located closer to the cutting teeth than the first discreteopening.
 5. The hole saw of claim 1, wherein the group of openings is afirst group of openings and further comprising: a second group ofopenings extending between the outer surface and the inner surface ofthe saw body, wherein the second group of openings comprises: a thirddiscrete opening having the first shape; and a fourth discrete openinghaving the second shape; and an uninterrupted area located between thefirst group of openings and the second group of openings.
 6. The holesaw of claim 5, wherein the outer surface of the saw body iscylindrical, wherein the first shape is a hexagonal shape.
 7. The holesaw of claim 5, wherein a total circumferential width of both the firstand second groups of openings combined is at least 50% of a totalcircumferential width of the saw body.
 8. The hole saw of claim 1,wherein a shortest distance from the first discrete opening to thesecond edge is between 1/16^(th) of an inch and ½ inch.
 9. The hole sawof claim 8, wherein a shortest distance from the second discrete openingto a gullet between adjacent cutting teeth is between 1/32^(nd) of aninch and 1 inch.
 10. A hole saw comprising: a saw body having a firstedge located at a first end of the saw body and a second edge located ata second end opposite the first end, the saw body including an outersurface and an inner surface defining a hollow internal area; cuttingteeth extending from the first end of the saw body; an end cap coupledto the second end of the saw body, the end cap including a hub; an arborconfigured to couple the hole saw to a driving tool, the arbor coupledto the hub and extending outward from the end cap in a directionopposite from the cutting teeth; a first group of at least threediscrete openings extending between the outer surface and the innersurface of the saw body, wherein a first discrete opening and a seconddiscrete opening of the first group have the same shape as each otherand a third discrete opening of the first group is smaller than thefirst and second discrete openings of the first group; a second group ofat least three discrete openings extending between the outer surface andthe inner surface of the saw body, wherein a first discrete opening anda second discrete opening of the second group have the same shape aseach other and a third discrete opening of the second group is smallerthan the first and second discrete openings of the second group; and anuninterrupted area located between the first group of at least threediscrete openings and the second group of at least three discreteopenings.
 11. The hole saw of claim 10, wherein the first and seconddiscrete openings of the first group have the same size as each other.12. The hole saw of claim 11, wherein the first and second discreteopenings of the first group have the same size and same shape as thefirst and second discrete openings of the second group, wherein thethird discrete opening of the first group has the same size and sameshape as the third discrete opening of the second group.
 13. The holesaw of claim 10, wherein the first, second and third discrete openingsof both the first and second groups are symmetrical in a circumferentialdirection.
 14. The hole saw of claim 13, wherein the first and seconddiscrete openings of both the first and second groups are symmetrical ina longitudinal direction.
 15. The hole saw of claim 10, wherein a totalcircumferential width of both the first and second groups combined is atleast 50% of a total circumferential width of the saw body.
 16. The holesaw of claim 10, wherein a shortest distance from the third discreteopenings of both the first and second groups of openings to a gulletbetween adjacent cutting teeth is between 1/32^(nd) of an inch and 1inch.
 17. A hole saw comprising: a saw body having a first edge locatedat a first end of the saw body and a second edge located at a second endopposite the first end, the saw body including an outer surface and aninner surface defining a hollow internal area; cutting teeth extendingfrom the first end of the saw body; an end cap coupled to the second endof the saw body, the end cap including a hub; an arbor configured tocouple the hole saw to a driving tool, the arbor coupled to the hub andextending outward from the end cap in a direction opposite from thecutting teeth; a first group of at least three discrete openingsextending between the outer surface and the inner surface of the sawbody, wherein a first discrete opening and a second discrete opening ofthe first group are both symmetrical in a circumferential direction anda third discrete opening of the first group is smaller than the firstand second discrete openings of the first group; a second group of atleast three discrete openings extending between the outer surface andthe inner surface of the saw body, wherein a first discrete opening anda second discrete opening of the second group are both symmetrical in acircumferential direction and a third discrete opening of the secondgroup is smaller than the first and second discrete openings of thesecond group; and an uninterrupted area located between the first groupof at least three discrete openings and the second group of at leastthree discrete openings.
 18. The hole saw of claim 17, wherein the firstand second discrete openings of the first group have the same size andshape as each other.
 19. The hole saw of claim 18, wherein the first andsecond discrete openings of the first group have the same size and sameshape as the first and second discrete openings of the second group,wherein the third discrete opening of the first group has the same sizeand same shape as the third discrete opening of the second group. 20.The hole saw of claim 19, wherein the first and second discrete openingsof both the first and second groups are symmetrical in a longitudinaldirection, wherein the third discrete openings of both the first andsecond groups are symmetrical in the circumferential direction.